User Agent
Mozilla/5.0(X11;Cros x86_64 10718.39.0) AppleWebKit/537.36(KHTML,like Gecko) Chrome/68.0.3440.48 Safari/537.36

Chrome Version: 68.0.3440.48 
Chrome OS Platform: 10718.39.0 (Official build) stable-channel auron_paine
Firmware Version: Google_Auron_paine.6301.58.98
ARC: 4869756
Network info: Googleguest

Preconditions:
1) Device running latest version of Chrome OS.
3) Ensure the device serial number noted in step 1 is assigned to Device OU with public session enabled.
4) Ensure these Device OUs have their policy settings.

Procedure:

1) Enroll the device and make sure the device is added to OU with public session enabled (Public session Kiosk : Allow Public Session Kiosk)

2) Click the Public Session avatar on the Sign In screen to start the PS session.

3) On CPanel, move device to another OU, in which Public Session is disabled. (Public session Kiosk : Do not allow Public Session Kiosk)

Expected Result:
1) Public Session can be started when Public Session Policy is enabled.
2) Public Session exits after moving device to an OU where Public Session Policy is disabled.

Actual Result:
1) Public Session can be started when Public Session Policy is enabled.
2) Public Session doesnot exits after moving device to an OU where Public Session Policy is disabled. 

How frequently does this problem reproduce? Always

Additional Information: 
Issue is reproducible on below listed devices as well 

Kevin MP
Chrome Version: 68.0.3440.48 
Chrome OS Platform: 10718.39.0 (Official build) stable-channel Kevin
Firmware Version: Google_Kevin.8785.264.0
ARC: 4869756

Tiger DVT2
Chrome Version: 68.0.3440.45 
Chrome OS Platform: 10718.36.0 (Official build) stable-channel Veyron_Tiger
Firmware Version: Google_Veyron_Tiger.6588.237.0
ARC: 4864431